1--TEST-- 2Test array_filter() function : basic functionality 3--FILE-- 4<?php 5/* Prototype : array array_filter(array $input [, callback $callback]) 6 * Description: Filters elements from the array via the callback. 7 * Source code: ext/standard/array.c 8*/ 9 10 11echo "*** Testing array_filter() : basic functionality ***\n"; 12 13 14// Initialise all required variables 15$input = array(1, 2, 3, 0, -1); // 0 will be considered as FALSE and removed in default callback 16 17/* Callback function 18 * Prototype : bool even(array $input) 19 * Parameters : $input - input array each element of which will be checked in function even() 20 * Return type : boolean - true if element is even and false otherwise 21 * Description : This function takes array as parameter and checks for each element of array. 22 * It returns true if the element is even number else returns false 23 */ 24function even($input) 25{ 26 return ($input % 2 == 0); 27} 28 29// with all possible arguments 30var_dump( array_filter($input,"even") ); 31 32// with default arguments 33var_dump( array_filter($input) ); 34 35echo "Done" 36?> 37--EXPECTF-- 38*** Testing array_filter() : basic functionality *** 39array(2) { 40 [1]=> 41 int(2) 42 [3]=> 43 int(0) 44} 45array(4) { 46 [0]=> 47 int(1) 48 [1]=> 49 int(2) 50 [2]=> 51 int(3) 52 [4]=> 53 int(-1) 54} 55Done 56